On 08/05/2012 02:50 PM, Rok Oblak wrote:
An additional comment regarding the gap around the briquette - At
later stages of burning the briquette partially shrinks and starts to
burn from the outside as well, this helps to burn faster in that stage
which is really important as briquettes give loads of CO in late stage
and burn less powerful. The gap around is a simple feature helping the
briquette to burn equally at all stages
Back when I was studying solid fueled rockets (please, no rocket science
jokes), I noticed that the center holes were NOT round for constant
thrust, but were star or polygonal shaped. The inner area was constant
as the fuel/oxidizer burned.
It seems if the inside of a briquette were not round (so there was more
exposed area), energy output over the burn could either be higher at the
beginning or constant throughout the burn. If you look at a simple
splined shaft, for example, the opening has much more area initially,
but when the spline burns through, the area drops.
Thoughts and comments gracelessly accepted here.
Dave 8{)
--
/"The first method for estimating the intelligence of a ruler is to look
at the men he has around him."/
Niccolo Machiavelli
/
NOTE TO ALL:
When forwarding emails, please use only "Blind Carbon Copy" or "Bcc" for
all recipients. Please "delete" or "highlight & cut" any forwarding
history which includes my email address! It is a courtesy to me and
others who may not wish to have their email addresses sent all over the
world! Erasing the history helps prevent Spammers from mining addresses
and viruses from being propagated. /
THANK YOU!
_______________________________________________
Stoves mailing list
to Send a Message to the list, use the email address
[email protected]
to UNSUBSCRIBE or Change your List Settings use the web page
http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org
for more Biomass Cooking Stoves, News and Information see our web site:
http://www.bioenergylists.org/
